Firbas W, Müller G
Hear Res. 1983 Apr;10(1):109-16. doi: 10.1016/0378-5955(83)90021-7.
The efferent auditory innervation of the budgerigar (Melopsittacus undulatus) was investigated by means of acetylcholinesterase staining. The course of the efferent fibres is described: the single terminal fibre regularly branches out to innervate several hair cells. Three types of efferent, axosomatic synapses could be distinguished: small outer hair cells bear large cup-like efferent synapses, intermediate hair cells with cone-shaped synapses, and tall inner hair cells with small, knob-like synapses. In the basal part of the cochlea the small hair cells with heavy efferent endings predominate, while in the apex only tall inner hair cells with small efferent terminals exist. There are more intermediate hair cells in the apical area than in the basal area.
通过乙酰胆碱酯酶染色法对虎皮鹦鹉（Melopsittacus undulatus）的传出听觉神经支配进行了研究。描述了传出纤维的走行：单个终末纤维有规律地分支以支配多个毛细胞。可区分出三种类型的传出轴体突触：小的外毛细胞带有大的杯状传出突触，中间毛细胞带有锥形突触，高的内毛细胞带有小的、瘤状突触。在耳蜗基部，具有粗大传出末梢的小毛细胞占主导，而在顶端仅存在具有小传出末梢的高内毛细胞。顶端区域的中间毛细胞比基部区域的更多。
